Carburetor



Aug. 12, 1952 P. C. LACOSTE CARBURETOR Filed Oct. 22, 1947 INVENTOR. PAUL- CALIXTE A sTE Patented Aug. 12, 1952 ,7 2,606,751 f ".I ARBURETOR v 'Paul Calixte Lacoste, Montrouge, France; Veuve Lestant, heiress of the estate of said Paul izCalixte. Lacoste, deceased, assignor to Andre A a P is, Fran e 1 Application oc'tbiierzz, 1947, Serial No. 781,476 I'n-FranceOctOber 22, 1946 .My invention relates to. a carburetor...

It is a well-known fact that since modern carburetors-have been substituted. for the old wick carburetors, no decided improvementv i has. been accomplished in carburetorsexcept for the. use of the'fiooded jet ,producing'a downward constant output flow.

Such arrangements have been completed by various auxiliary arrangements such as idling carburetors, recycling pumps and the like for improving to a certain extent the conditions of carburetion. But no essential modification has been brought to the formation of the mixture of air and fuel adapted to feed the engine cylinders. As a matter ofiact thedroplets of fuelproje'cted by the carburetor jet'are collected inthe form of liquid streamlets and-the latter are urged against the collecting pipes and arenot uniformly distributed-inside the cylinders. The mixture is too richin the first cylinder and too poor'in the last, which leads to an excessive coms'umption of 'fuel and. a .rapid wear of. the cylinders and pistons. v

A carburetor"according to the invention removes sjuch drawbacks and submits the mixture of 'air and liquidfuel atomis'ed in fine droplets at the output of the jet, to a suction movement directed perpendicularly to the normal suction a'o'la ms. (01. 261-75) axis and then to a movement of revolution inside a space specially provided for such purpose and out of which it is sucked and sent into the engine admission pipe.

The mixture thus obtained is not constituted by air admixed with atomised liquid fuel but by an intimate homogeneous mixture of air and vaporized fuel.

This invention is applicable either to a carburetor including an arrangement adapted to produce an efficient stirring of the mixture or else inside an auxiliary carburetor that is inserted in the path of the gases between the main carburetor and the engine.

Such an arrangement consists chiefly of a chamber the diameter of which is greater than that of a pipe admitting air or gases and opening into same. Inside said chamber are provided cylindrical or the like spaces adapted to form supplementary turbulency zones.

The fuel is fed by a spray nozzle or jet the slots of which are arranged in a manner such that the output may be provided in a transversal direction.

A better difiusion may be provided by projecting the carburetting fuel on to a heated tube of annular shape or by setting it into contact along 2 the walls of the carburetor with heated surfaces or again by setting it in contact with thesurface of a porous body.

The accompanying drawing illustrates a form of execution of a carburetor according to my invention. 1

The carburetor is fed by a central jet or, spray nozzle 6 including a cover 1 and slanting slots for the output of the fuel. The fuel thatis difiused fanwise is projected on to a hot pipe 9 inside the large chamber Hi. It moves over, the Walls In of, the chamber, fiows through the turbulency zone H and finally sweeps over and saturates a porous body I2. The intimate mixture of air and carburetting fuel thus obtained is sucked into the admission pipe of the engine l3. Obviously the scope of my invention is by no means restricted to the abovedisclosed particular form of execution of said invention. Numerous modifications may be obtained by modifying the size and shape of the apparatus; the zone of turbulency may be executed by means that are very difierent and the otherarrangements disclosed are not essentiaLmy inventionbeing. characterized primarily by the carburetor and the multiple applications thereof falling within the scope' of accompanying claims and adaptedt various possible requirements.

What I claim is:

1. In a carburetor, in combination, an admission tube for admitting an air-fuel mixture to the engine, the said admission tube having an end distant from the engine; a casing having side walls and a pair of opposite walls, forming a mixing chamber and being connected at one of said opposite walls to said end of said admission tube, said one of said opposite walls of said casing being formed with an aperture passing therethrough and in alignment with said admission tube, the said casing being of a substantially larger cross sectional area than said admission tube, whereby said side walls of said casing form a first extension of said admission tube which is of larger cross sectional area than said admission tube; a single baflle in said casing, said baffle being annular, forming a second extension of said admission tube and being of the same cross sectional area as said admission tube, the said bafile extending for a substantial distance into said casing and terminating in an end spaced from the other of said opposite walls of said casing, the space between said end of said battle and said other opposite wall of said casing being substantially free and unobstructed; and duct means having an open end portion in alignis drawn from about said bafile into said admission tube.

2. In a carburetor, in combination, an admission tube for admitting an air-fuel mixture to the engine, the said admission tube having an end distant from the engine; acasing ha-vingside walls and a pair of opposite walls, forming a mixing chamber and being connected at one of said opposite walls to said end of said 'admission tube, said one of said opposite walls of said casing being formed with an aperture passing therethrough and in alignment with said admission tube, the said casing being of a substantially larger cross sectional area than said admission tube, whereby said side walls of said casing form a first extension of said. admission tube which is of larger cross sectional area than said admission tube; an annular b'afiie formin'g -a s'ec ond extension of said admission tube and-being of the-same cross sectional area as said admission tube, the said baflie extending approximately one-half of the distance f-romsaid one of said opposite walls of saidcasing to the 'otheroi said opposite walls of said casing; means ior admitting air into said casing at said other of said opposite walls thereof; and means for spraying fuel against said side walls oi said casing, whereby the air-fuel mixture will expand "throughout said casing and be thoroughly mixed by said ba-file before said mixture is drawn from about said bailie into said admission tube.

3. In a carburetor, in combination, an admission tube for admitting an air-fuel mixture to the engine, the said admission tube having an end distant from the engine; a substantially cylindrical casing'havin-g side walls and a pair of opposite walls, forming a mixing chamber and being concentrically connected at one offsa'id opposite walls to said end of said admission tube, said one of said opposite walls of said casing 4 being formed with an aperture passing therethrough and in alignment with said admission tube, the said casing being of a substantially larger cross sectional area than said admission tube, whereby said side walls of said casing form a first extension of said admission tube which is of larger cross sectional area than said admission tube; a single baflle mounted in said casing, being annular, forming a second extension of said admission tube and being of the same cross sectional area as said admission tube, the said bafile extending approximately one half of the distance from one of said opposite walls of "said casing to the. other of said opposite walls of said-casing and the other half of said distance being substantially free and unobstructed; means for admitting air into said casing at said other of said opposite walls thereof, said air admitting means being in alignment with said admission tube; and means for spraying fuel against said sidewalls of said "casing, :whereby the air-fuel mixture will expand throughout said casing and be thoroughly mixed by said baifle before said mixture, is drawn from about said bafiie into said admission tube. a

PAUL 'CALDCIE LACO'STE.

REFERENCES CITE-D The following references are of record in the filc of this patent:

UNITED STATES PATENTS 

